INS and type 2 diabetes mellitus: Because insulin secretion is generally preserved to some extent in people with T2D, DK/DKA does not generally occur unless triggered by a severe infection, etc. However, in recent years, attention has been drawn to the existence of a subtype of T2D in which DK/DKA easily develops and/or repeats without any precipitating factors, that is, ketosis-prone type 2 diabetes (KPD) [1].